CSS Syntax and rule

CSS Syntax and Rules.

The CSS declaration.

You specify this as a property followed by a colon, where the property can be for instance a color,
a margin-left or a background-color. Then you must specify the
value that is related to the property. It all ends with a semicolon.

property: value;

The CSS Rule.

The purpose of a CSS rule is that it can be used several times
by your html elements in one or more web pages.

A rule has two fundamental parts, the selector and the declaration block.
The declaration block is composed of one or more CSS declarations,
and each CSS declaration is a pairing of a property and a value.

selector {property: value; property: value; ..... }

The selector defines which piece of the HTML document that will be affected of the rule.
The following session will explain the details about the selector, properties and values.